Abstract
Extended X-ray absorption fine structure (EXAFS) spectra differed slightly with neutralization level in nominally dry ethylene–methacrylic acid copolymer ionomers neutralized with zinc. These small changes in EXAFS spectra were used to infer that decreases in average aggregate size occur with the decreasing neutralization level and that all zinc ions are in aggregates. However, at sufficiently low neutralization levels, EXAFS results indicate some isolated zinc ions were also present. If no water is present, aggregates almost certainly terminate in zinc cations coordinated to two oxygen atoms from bidentate non-chelating carboxylate anions and two oxygen atoms from bidentate chelating carboxylate anions.
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